feat(client): 商品详情页展示所有字段，补全分类/库存预警/备注/自定义字段/描述文档

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/lib/models/product.dart

@@ -18,10 +18,14 @@ class Product {
   final String? remark;
   final Map<String, dynamic>? customFields;
   final List<ProductImage> images;
-  // 产地/保质期/储存方式名称（Detail 接口 Preload 后填充）
+  // 产地/保质期/储存方式/分类名称（Detail 接口 Preload 后填充）
   final String? originName;
   final String? shelfLifeName;
   final String? storageName;
+  final String? categoryName;
+  // 描述文档（关联的字典记录）
+  final String? descriptionDocTitle;
+  final String? descriptionDocContent;
 
   const Product({
     required this.id,
@@ -44,6 +48,9 @@ class Product {
     this.originName,
     this.shelfLifeName,
     this.storageName,
+    this.categoryName,
+    this.descriptionDocTitle,
+    this.descriptionDocContent,
   });
 
   factory Product.fromJson(Map<String, dynamic> json) => Product(
@@ -78,6 +85,9 @@ class Product {
         originName: (json['origin'] as Map<String, dynamic>?)?['name'] as String?,
         shelfLifeName: (json['shelf_life'] as Map<String, dynamic>?)?['name'] as String?,
         storageName: (json['storage'] as Map<String, dynamic>?)?['name'] as String?,
+        categoryName: (json['category'] as Map<String, dynamic>?)?['name'] as String?,
+        descriptionDocTitle: (json['description_doc'] as Map<String, dynamic>?)?['title'] as String?,
+        descriptionDocContent: (json['description_doc'] as Map<String, dynamic>?)?['content'] as String?,
       );
 
   Map<String, dynamic> toJson() => {